Now that you mention it, it also seems strange that the bolt is even somewhat bent in the middle (not just at the front where the brake is actually mounted). Is this possible with the bolt secured at both ends or does it indicate that something acted on it from inside the fork crown?

One possibility is that along the inside of the fork the stem riser is actually tied to this bolt with a cable ("brake" type cable). The purpose is to prevent you from accidentally pulling the stem riser out while unfolding, but it's not supposed to bear any force (that's accomplished by a regular quill type expanding wedge). Surely this cable couldn't bear enough force to bend the bolt if the wedge wasn't sufficiently tightened and the rider was yanking on the bars? Surely braking forces themselves would be the far greater and more likely candidate?